holinger



Nov. 6, 1928.

E. F. HOLINGER SOUND REPRODUCING DEVICE Filed June 17, 1927 VII/Ill!" INVENTOR [2271/ i //o// 1 ATTORNEY Patented Nov. 6, 1928.

UNITED STATES PATENT OFFICE.

EMIL F. HOLINGER, OF NEW YORK, N. Y., ASSTGNOR OF ONE-HALF TO E. .CHASTE CROWLEY, OF NEW YORK, N. Y.

mo DEViCE.

Application filed June 17, 1927. Serial No. 199,504.

This invention of sound waves in general; but is more parmaterial located between the poles o ticularly designed, so far as the present emmanent magnet.

bodiment thereof is concerned, for use in through perforations-inithe lower radio receiving sets. The present invention pair of goose comprises certain improvements on construcside of the permanent 3111321181]: P

is designed to provide the pole pieces 4, L and engage threaded re means for the clear and accurate reproduction cesses in a spacing block 8 of non-mag ti f the per- These 5 bolts also. pass {neck springs 7-, 7; located-outo'lesg: T and tions ofithe general type disclosed 'in-' my through grooved clamp sh0esf3 ,-:3 Wh

pending application Serial No;'133.581, filed Sept. 24, 1926, alloWed-May 19 1927, and in a my pending application Serial.:-No.-. 185',994, .a

rezithereby-L firmly assembled; in llgrunent and spaced relation; as ;w

filed April 23, 1927. In this type 0t my-iinin Fig. Thespaceriblock 8zmayb vention as in those disclosed inTrny-saidprior .t0 receive-the: pole pieces 4',"4"'3S' applications, the resonant member consists Fig. 2.

of a hollow body of thin, stifi,-but'sliglitly elastic material, such as vvood or fibrou's composition to which the armature of: an electroa magnetic receiving element is attached,-butI 4 formed is;.-p

ingflL- the exterior, u have found-that the quality,- accuracyrand filflfilxfianges ;The armature 9 for-the .electroniagnet'thus referablyzmadezliystamping out having a?central openinwardly bent senii-cir? i12r=and zth laterallyl proj ecting" rthin softziron plate volume of the tone reproductionsiarevconf-efir's 3 ranged,' dialiietrically taching the vibration producing meansjto the I1 smaller end of such member; 1: 1: a

The best form of apparatus n'owkliown to panying sheet; ot dravi ings-fiin nonmagnetic mat erial 's'uch ias=bron ze=, and 6 2 IS a permanent:-magnet1 mounte d -"1nsa1d 0 siderably further increased if 'saidrnember o lehanother asid Inagnet-ic 'm'at'evi ten'ed'tosaid ears 13,-':13 me embodying my invention is -illustra'ted:in 10: solderedr-joihtsioraby ::F'ig;'.-"1:---::'I9i v.19. 3 threaded into on ti tkn .bh zli iarsezor: lower thearmatu're' I i i -'tOfthe 'pole'ipiece' suh only; riT The ."fesonaht membeii characters indicate like parts -1-'is the base form of my"+inveritiong is co of the apparatus which may b e lnade'of any {the gencral sha p eck springs 7 saidvscrew 'bolt's areiset-up tightlyithe p'arts accurate ell shown e? grooved shown in oppos ite escribed*aild 5h6wn morein is given a generally'obovoidushapepsucht as de il lnarny saidi1pendingi applieati may be produced by joiningthe base of-a NiO =185,944.=-: cone to a portion of a sphere,"-and athenzatsuppforte'd upon the-u-p"pe pend'siof-i omSer-ial preferably e gooseecks of'eacli sprir'ig 'Zj.7jand bearing'iipon tllfEiOthGl'ESCCtiOIl of 'said'goose neck$by vvhich r sa d supporting springs 7, 7* I f'er'ence I 1nth'ef preferred the snipe base- Soft iron polei 'pices45 4 are f'astend 279 1 18aretangent tdthe surfaceo'f; the 'sp'h'ei'ito the poles of magnet Q afldprovidedgwithr: aljiportion' at th magnetic coils 5,-5. adapted to be 'c0rinected,r)p0rt1ons;: in the receivingcircui-t. I :The lflpermanentw'ther-irlmc ated conical e fi ifiction poin t of tlie-Cvvo "iPrefetably theapjil'e of flare of port-ion 16a is about 50::

magnet is F fastened to the base 1 inwaliy coni deir'eesawhich caussthe walls foit' the dowel armature plate-9: Theanaa-t to ft'he re'sonan ngle of about member therwise attach n l the walls "of a'ra etws s me; 1 1 s reduced 1's -supporte d,at its page fastened mei n' the resonant id armature. mbet I thus r efitl by the upper end of the rod or tube 14 which extends through its interior ,an'd, is clamped to it by means of the nuts 15, 15 engaging the threaded upper end of said rod or tube.

The pear-shaped resonant member may be formed in a variety of ways but I prefer to make it of a series of strips 16, 16", 16 of resonant material, such as \vood,;or pa -pei which are joined together at the upper end by being cemented to a-ring-shaped piece of wood or cardboard 21 and to an overlapping cap plate'Q-Q of similar material. 17"represents an annular fold of wave-like cross section 'in the wall of the resonant member extending aroim'd the same approximately-midway-between its ends. and; 1 8. l8 amperforaerahly located in said crease.

an operating my invention, 'the magnet .coils 5, 5, are connected in the electrical-cir- =cuit ofitheradio receiving unit and'the arma- -tionsthrough the wallet said member prefture"-9' is adj ustec'l' toward or from 'the 'pole i'eries-;4,-4,' by means of the screws 19, 191111- zrtihthe best results'in-sound reproduction are obtained.

:I fi11d-1that making 'th'at portion o'fthe resonanhmernber to which the armature is attached in the shape of thetruncated cone, as -shown, -very greatl inoreases'thewolume and sensitiveness oft esound'reprtiducfijon. :By .means f this apparatus -'I "a'nr able to =bring out fully-the lo-w'er or bassmdtesof any musical composition reproduced ithoutsim a-iringthe reprodufiion oftlie higher notes, clearly developing even the lowest notes'of1a great'orgaml The --volume and quality of the sound reproduction-wary according-to the sim of't-he vresonant member, the-loudness =uncneasmg with the size; of the-member; at' l'east' within certain limits. "Excellent results are-obtained with-Ian appamatus in whiohthe diameter of the;globularportiori of=-the 're'sonant-member is sixteen inc-hes;

-80"; far *as It :can at present determine; the main portions of the sbund-wavesiare-g'enerated by the vibration 'of-thatrportionmf the -a-esonant-' member belowthe crease -1 7 while the-upper. ortionof studmember-serves as a sounding-1 onrd. mainly usefulhm reflecting and concentrating -the sound :W-HNGS, an

-ibncingftrl1mn to escape through'the-openings -18. 118. Tllhe crease 1-7 in 'the walls-aofjthc resonant .member practically acts as a-ihinge,

wper mittingra trcer vibration of' theremainwalls, and Ve'rTy'greatly in- ,creasm'g the sen-sitiveness and nvolume-of sound.reproduetion.-

Marious changes-could be -made 1n ithe rela- ,tiveanrangementand construction-of'the oo n; .stituent, elements herein. described Md-1llll5- tratedwitlrout departin the principle of construction here disc osed, or entirely dc stroying the improved results above outlined.

Having described my invention, I claim:

1. A sound reproducing device comprising i combination, a; hollow nem'her .ot';suhs(;mtially pear shape having one portion in the form of a segment of a sphere, and th rest substantially-cone shaped, both madcor' thin,

resonant imaterial, and means for imparting sound Vibrations to said member attached to the smaller iend thereof.

2. A sound reproducing de ice comprising, 'in combination,adrollow member of substantially pear shape having one portion in the ferm of a-segment of asphere, and the rest substantialh 'c-oneshapedg'both made oft-Inn resonant materiah'zand.nieans for imparti ng sound v'ibnations to said member attached to the smaller endthereof, togethorwith a support for said member attached to its larger en'd.

3.- Y'Asanelement in: a sound-reproducing "dvire, a "holl0iv,'i thi'n-walled choroid reso- =nant member fh'aving can largeiclosedqend of globi1larshape; ahd a-smazlier open end in the shape of a-truncatedwori'e-tangent to the-rad- 'jacent globular 'portion;

- Z4. A structure such-tasdefincd-iin-claim=3 in which the arigil'e of flare -ofzsaid =co'nical ;por --*tion is about-fifty degrees.

5 :Aseundrepaoducingflevice comprising, I in. combination, urholl'ow;:thin-wa-llecl pearshapcd'menlber havin nits larger iporti on of: a generallyspheroidalimme; and: the restsub stantially cone slhape,:and having an=opening at its smaller-.end,-'means for impa rt-ingso un'd xiibrationsg'bwsziid member attached to its wvallsnearlzsaidaopening, and a :suppo rtex- --.tending='through-?said opening and attached to said memberatfitsopp'oa'te and-larger end. .6. Abombinationsuch:as.detined in claim 5 in whichlthere dead-circumferential =orcasc :in theovdllsnfisa'lid pearshaped inemberextendin around the same. "ll -.A-combinati.onsuch=us defined in claim inqvhiehethereiisia-tcneaseriri the-Walls. of said pear-sh aped member extending-eirctunferen- .itially' uroundzthe lar gerend-theizeof.

8. A combination such as defined in claim -5inwhichzthereisa'euease in the .walls'ofsaid =pear-shapexl member. -(ixtendixig circumferen ltial'lly amoundlthetlargenend; thereofzand por- :forations flh rough :th avails f said crease.

2-9.; A Boundneproduoing:dev-iee comprising, in combination, a--liolld\v,. thin-walled, pearshaped:-resonant;member closed at its :Iaitger .end, having -an 'opening in itsside, and being -openaat titsesifnallenend, a iaupport {or said inemberia'ttached to: its langer en'd, and aneans fomimpahtiaag sonndwibrations attached :to

nitssmallerendi 5 I :lOhfIn =a sound jlreproducing device :suit- ,able ior use; in Zradio. apparatus; having an ele c tron1agnet, the -coils-of;- which are adapted to be includedain a reproducing circuit, the combination, .with the above recited. appara- ..tus,,of .ahollow, substantially pear-shaped member made of thin, resonant material, having an opening in its side, and an armature for said electromagnet fastened to said member at its smaller end.

11. A structure such as defined in claim 10 combined with a support for said pear-shaped member attached to it at its larger end.

12. A combination such as defined in claim 10 in which said pear-shaped member has a circumferential crease in its wall, in which crease said side opening is located.

13. A combination such as defined in claim 10 in which said pear-shaped member has a circumferential crease in its walls producing a wave-like cross section thereof.

14. In a sound reproducing device suitable for use in a radio receiving set having an electromagnet, the coils of which are adapted to be included in a reproducing circuit, the combination, with the above defined apparatus, of a hollow, substantially pear-shaped member made of resonant material having a circumferential crease located substantially midway between the ends of said member and having a series of openings therethrough, a support attached to said member at a point remote from said crease, and an armature for an electromagnet attached to the smaller end of said pear-shaped member at a point in the field of force of said magnet.

15. In a sound reproducing device suitable for use in a radio receiving set having an electromagnet, the coils of which are adapted to be included in a reproducin circuit, the combination with the above de ned apparatus of a vertical support extending upward from said magnet, a hollow, substantially pearshaped member formed of resonant material surrounding said support with its lar er end uppermost and fastened thereto and Iiaving a circumferential crease in its walls of curved cross section extending around its medial portion, and an armature for said magnet located in the field of force thereof and fastened to the smaller and lower end of said pear-shaped element.

16. A combination such as defined in claim 15 in which said pear-shaped member is pro vided with a series of openings through its walls located in said crease.

17. In a sound reproducing device suitable for use in a radio receiving set comprising, in combination, a horseshoe magnet, a hollow, substantially pear-shaped resonant member made of thin, stiff material and having an opening at its smaller end, a support for said member extending upward through said opening to the upper and larger end of said pearshaped member, an annular armature for said magnet surrounding said support and fastened to the wall of said resonant member at its smaller and lower end, two curved springs rigidly mounted with reference to said magnet and supporting said armature at diametrically opposite points thereof, and adjusting screws mounted in, and bearing upon, said spring and adapted to flex the same, whereby on the flexing of said springs any desired adjustment of said armature with reference to said magnet may be secured.

18. A combination such as defined in claim 17 in which said pear-shaped member has an annular crease in its walls at a point substantially midway between its ends.

19. A combination such as defined in claim 17 in which said pear-shaped member has an annular crease in its walls at a point substantially midway between its ends, and a series of perforations in its walls located in said crease.

20. A sound reproducing device comprising, in combination, a hollow obovoid member with its larger end of approximately spheroidal shape and its smaller end of gen erally conical shape, both formed of walls of thin, stiff, but elastic material, with an opening therein, and means for imparting sound vibrations attached to one portion of said member.

EMIL F. HOLINGER. 

